<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table
        class="tree-table"
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-index="true"
        index-text="#"
        border
        :show-row-hover="false"
      >
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: lightgreen; font-size: 20px"
          ></i>
          <i
            class="el-icon-error"
            v-else
            style="color: red; font-size: 20px"
          ></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag type="success" v-else-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag type="warning" v-else>三级</el-tag>
        </template>
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" @click="editCateDialog(scope.row)">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" @click="deleteCate(scope.row.cat_id)">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页器 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 4, 5, 10]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <!-- 添加分类的标签 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <!-- options 指定数据源 -->
          <!-- props用来指定配置对象 -->
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChanged"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 删除分类的对话框 -->
    <el-dialog
      title="删除分类"
      :visible.sync="editCateDialogVisible"
      width="50%"
    >
    <el-form
        :model="editCateForm"
        :rules="addCateFormRules"
        ref="editCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="deleteCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCate"
          >确 定</el-button
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //商品分类数据列表,默认为空
      cateList: [],
      //总数据条数
      total: 0,
      //为table指定列的定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          //表示将当前列定义为模列
          type: "template",
          // 表示当前这列使用的模板名称
          template: "isok",
        },
        {
          label: "排序",
          type: "template",
          template: "order",
        },
        {
          label: "操作",
          type: "template",
          template: "opt",
        },
      ],
      // 控制添加分类对话框的显示和隐藏
      addCateDialogVisible: false,
      //控制编辑分类对话框的显示和隐藏
      editCateDialogVisible : false ,
      //添加分类的表单数据
      addCateForm: {
        //将要添加的分类名称
        cat_name: "",
        //父级分类的Id
        cat_pid: 0,
        //分类的等级
        cat_level: 0,
      },
      //添加分类表单的验证规则对象
      addCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
          { min: 1, max: 10, message: "长度在 1 到 10 个字符", trigger: "blur" },
        ],
      },
      //父级分类的列表
      parentCateList: [],
      //指定选择器的配置对象
      cascaderProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //选中父级分类的id数组
      selectedKeys: [],
      // 获取删除分类的数据
      editCateForm:[],
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    // 获取商品分类的数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo,
      });
      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类失败");
      this.cateList = res.data.result;
      this.total = res.data.total;
    },
    // 监听pagesize改变的事件
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize;
      this.getCateList();
    },
    //监听pagenum改变的事件
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage;
      this.getCateList();
    },
    // 点击添加分类弹出对话框
    showAddCateDialog() {
      // 先获取父级分类数据列表
      this.getParentCateList();
      this.addCateDialogVisible = true;
    },
    // 获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 },
      });
      if (res.meta.status !== 200)
        return this.$message.error("获取父级数据失败");
      this.parentCateList = res.data;
    },
    // 选择项发生变化触发的函数
    parentCateChanged() {
      console.log(this.selectedKeys);
      //如果selectedKeys数组中的length大于0，证明选中父级分类
      if (this.selectedKeys.length > 0) {
        // 父级分类的id
        this.addCateForm.cat_pid =
          this.selectedKeys[this.selectedKeys.length - 1];
        this.addCateForm.cat_level = this.selectedKeys.length;
        return;
      } else {
        this.addCateForm.cat_pid = 0;
        this.addCateForm.cat_level = 0;
      }
    },
    // 点击添加分类
    addCate() {
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          "categories",
          this.addCateForm
        );
        if (res.meta.status !== 201)
          return this.$message.error("添加分类失败！");
        this.$message.success("添加分类成功！");
        this.getCateList();
        this.addCateDialogVisible = false;
      });
    },
    //监听添加分类对话框关闭事件
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields();
      this.selectedKeys = [];
      this.addCateForm.cat_level = 0;
      this.addCateForm.cat_pid = 0;
    },
    //控制编辑对话框的显示
    editCateDialog(list){
      this.editCateDialogVisible = true;
      this.editCateForm = list;
    },
    //修改用户
    editCate(){
      this.$refs.editCateFormRef.validate(async valid => {
        if(!valid) return;
        const {data:res} = await this.$http.put(`categories/${this.editCateForm.cat_id}`,{cat_name:this.editCateForm.cat_name});
        if(res.meta.status !== 200) return this.$message.error('编辑分类失败');
        this.$message.success('编辑分类成功');
        this.editCateDialogVisible = false;
        this.getCateList();
      })
    },
    //删除分类
    async deleteCate(id){
      const result = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err);
      if(result !== 'confirm') return this.$message.error('取消删除');
      const {data:res} = await this.$http.delete(`categories/${id+''}`);
      if(res.meta.status !== 200) this.$message.error('删除失败');
      this.$message.success('删除成功');
      this.getCateList();
    }
  },
};
</script>

<style lang="less" scoped>
.tree-table {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>